Ascientist hypothesizes that the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. the independent variable is (a) the temperature (b) the gender of the alligator (c) the incubator (d) the male alligators.

Explanation:

There are two variable in this (mental) experiment. The temperature and the gender of the alligator.

The temperature its the independent variable, its the one we can control using the incubator.

The gender of the alligator, its hypothesized, will be determined by the temperature, so, its the dependent variable in our hypothesis.

The incubator will be used in all the eggs of the experiment, so, its not a variable.

The male alligators its one of the possible outcomes of the experiment. Again, not a variable.